Regulator for pneumatic service systems.



J. J. STOETZEL.

REGULATOR FOR PNEUMATIC SERVICE SYSTEMS.

APPLICATION TILED OCT. 11, 1911.

Patented J 1113; 21, 1914.

UNITED STATES PATENT orrron JOSEPH J. STOETZEL, OF CHICAGO, ILIJINQIS,-ASSIG-NOR TO PNEUMATIC TUBE APPLIANCE COMPANY, OF CHICAGO, ILLINOIS,ACORBOMTION OF ,ILLINQIS.

REGULATOR FOR PNEUMATIC SERVICE SYSTEIS.

Specification ofletters Patent.

Patented July 21, 1914 Application filed October 11, 1911.Soria1io.654,18i5.

To all whom it may concern:

Be it known that I, JOSEPH J. S'ron'rznL, a citizen of the United Statesof America, and a resident of Chicago, county of Cook, State ofIllinois, have invented certain new and useful Improvements inRegulators for Pneumatic Service Systems, of which the following is aspecification.

The main objects of this invention are to provide an improved form ofregulating device for controlling the connection between a pneumatictransmission line and the source of power, whereby the line may be atall times ready for service at full power, altlumgh requiring but anextremely small amount of power during intervals of disuse; to provide adevice of this kind which is automatic in its operation and adapted topractically cut oil the flow of air during periods when no carrier is intransit and to instantly start an adequate flow when a carrier isinserted into the line; and to provide a device of this kind which isreadily adjustable to suit the requirements of lines of various lengths.

An il ustrative embodiment of this invention is shown in theaccompanying drawings, in which F igure 1. is a longitudinal section ofa regulating device particularly designed for use in connection with atransmission line of the suction type. Fig. 2 is a diagrammaticrepresentation showing the manner in which the regulator is connected toa looped transmission line.

In the construction shown, two transit tubes 1 and 2 are arranged as inthe usual looped line, so as to provide dispatch and delivery terminalsat each of two stations. In the drawings, the station nearest the powerplant is designated A and the distant one, B. At the station A thedispatch terminal 3 is normally open, butthe delivery terminal 4* isnormally closed by a flap valve. At the station B, both tubes arenormally closed and connected by a branch tube 5 so that in effect bothtubes form a single continuous air duct.

The exhauster or other source of ower, designated by 4, is connected tothe line by a suction branch near the delivery terminal 4- in theusual'manner and the regulator 7 is interposed between the exhauster andthe transit tube.

In the formishown in ;the drawi the regulator comprises an outer cyliner or casing 8 and an inner cylinder or casing 9, the latter beingreferablyconcentric with the casing 8 an having itsinterion subdividedinto two chambers 10 and 11 by a stationary partition 12. The lower endof the casing 8 is connected by a pipe 13 to the exhaustertand the upperend is connected by a pipe 14to the transit tube near the deliveryterminal 4".

The upper end of the c linder 9 is open and 1s contmlledby a va ve 15.The side walls of the cylinder 9 are-provided with perforations 16 andl'fccnnecting the annular space 18 around said cylinder with thechambers 11 and 10 respectively.

The valve 15 is rigidly 19 with a piston 20, which is slidable in thechamber 11. The clearance space 21 in the lower end of the cylinder 9communicates with the outer atmosphere through one or more passages 22.

An annular partition 23 separates the annular space 18 from the space 24above the inner cylinder 9, and this partition 23 is slidable vertidallywith respect toboth the outer and inner cylinders and serves foradjusting the area 0f the passage provided by the openings 17. There isa passage 25 through "the partition 23 which serves as a by-pass betweenthe spaces 24 and 18, and this by-pass is controlled byta screw 26, by

means of which the minimum flr-wof air is regulated.

Theouter casing 8 extends a considerable distance above the t of theinner cylinder 9, and has mounted t sin a tubular member 27, within.which is slidabl cmounteda loose fitting piston va1ve28. is valve iscarried by a sleeve29, .which is slidably mounted on the valve stem 19,and by conoonnected bya rod tacting with the valve 15 :limits thedownward movement of the valve 28. The valve 28 is normally urged upwardaway .from the valve 15 by means of the spring 30. The outer peripheryof thetube- 27.is coyeredby alayer 31 of suitabldfpascking I asleather,so as to have airtight fit withthe walls of theouter cylinder, alonwhich i the tube 27;:nay be adjusted vertica y.by.meane of set screws 32which extend thmugh elets 33 in the easing 8. l The tube 27 hasimportion of-itsperiphery out away nearlthe upper end material, such J.1 the leeet fiewnwerd 1 9H cimv-a ii restriction mtg cs uf the m it:egwnlngs C heh w the disk I; the air the 4m 28 MW is edges the I return'm'wnnn time *1 pressure in H1, closed by a carrier,

air pressure below "valve 15. What t 40 in {he pm t e her with fut emavoid her 11).

"he IDILH. 45 28 18 to pun ha the val: U, pass s out Hi If" because itis tie: t Open 50 far that wh n 11 in 5 ou 50 tion, it will ufier m- "1mto the Ire-e How of air into the !U. are: it? therefore not be Rife inthe rate of flow of the 2 Inally held in the p bitlun in win 55 shown byfull lines in F5? 1 by 30, which hears bdw en "e! valve 15. \Vken tm Jekw the air max pass t'zthe ewe-11in 1M preemlre t pct) Wit! raise i n theupper limit ef its evexpen tand 1 the valve te the pesxtmn mdleeted edtines 1n Flg. L allow. r the free I the eunveying air current 111 theline. i The maximum air flow may he regulated by shifting the ring 23:50 to vary the efieethe area of the epemngs 17. As soon as the out. ofthe translt tube 1. the

REL and the {low of air 60 n mt. down as bevalve adapted to be shiftedfor omitted without departing from the spirit of this invention, asdefined by the'following claims.

I claim I. In a transmission tion of a transit tube, cally arrangedcasings, the outer of said casings being connected to said tube, meanscon nected to said outer casing and adapted to cause a transmitting aircurrent to flow through said tube centrically located with respect tosaid cas iugs, and coacting with the inner of said casings, forcontrolling the volume of said air current through said casin s, and apiston mounted in said inner casing and operatively connected to saidvalve, said piston being adapted to be actuated through variations insaid air current for shifting said valves.

2. In a pneumatic transmission system the combination of a transit tube,a casing connected thereto, means connected to said casing' and ada tedto cause a transmitting air current. to ow through said tube and casin apartition located in said casing and so dividing it into twocompartments, a controlling ommunication between said compartments so asto vary the volume of said air current passing throygh said tube andcasing, and a pnston located in one of said compartments operativelyconnected to said valve, .24 Lid piston being adapted to be actuated byariations in Said flow of air through said tube and casing, saidpartition having a assage leading therethrough for provitying constantcommunication between said compnrtments.

3. In a pneumatic transmission system the wmbina'tion of a transit tube,a casing cond the! to, means connected to said casted to cause atransmitting air :ow through said tube and cassystem the combinaa pairof concentriand casings, a valve coning, a partition located in saidcasing and subdividing itinto two compartments, a valve adapted to beshifted for controlling communication between said compartments so as tovary the volume of said air current passing through said tube andcasing, a piston located in one of said compartments and operativelyconnected to said valve, said piston being adapted to be actuated byvariations in said flow of air through said tube and easing, saidpartition having a passage leading therethrough for providing constantcommunication between said compartments, and means for adjusting thecross sectional area of said passage.

4. In a. pneumatic transmission system, the combination of a cylinderhaving one end connected to the transit tube and having its other endconnected with a source of power, a second cylinder located within thefirst, a partition subdividing said second cylinder into twocompartments, the upper end of said cylinder being open and saidcylinder having openings in its side walls connecting each of saidcompartments with the space around said inner cylinder, a piston mountedin the lower compartment of said cylinder, a valve controlling the openupper end of said cylinder and connected with said piston, the space insaid inner cylinder below said piston being connected with the outerair-,a second partition extending across the space between saidcylinders and having a bypass passage, and means above said valve andadapted through an increase in the volume of air entering said casing toclose said valve. I

Signed at Chicago this 9th day of October 1911.

JOSEPH J. STOETZEL.

Witnesses:

EUGENE A, RUMMLER, Enwzr PHELPS.

